Open wider.” requested the dentist, as he began his examination of the patient. “Good God !” he said startled. “You’ve got the biggest cavity I’ve ever seen - the biggest cavity I’ve ever seen.” “OK Doc !” replied the patient. “I’m scared enough without you saying something like that twice.” “I didn’t !” said the dentist. “That was the echo.
A husband and wife enter a dentist’s surgery. The husband says, ‘I want a tooth pulled. I don’t want gas or Novocaine because I’m in a terrible rush. Just pull the tooth as quickly as possible.’ ‘You’re a brave man,’ says the dentist. ‘Now, which tooth is it?’ The husband turns to his wife and says, ‘Show him your tooth, dear.’

I hate when my dentist asks when the last time I flossed was.  Like dude, don't you remember?  You were there.